An SSL certificate is required when switching to the HTTPS protocol, which provides a secure connection and user data protection. Using SSL allows confirmation of a domain name when connecting to a browser. For a number of devices and applications, a domain certificate is not enough: you must configure the certificate chain.What is a certificate chainInstalling an SSL certificate is an important step when switching to the secure protocol HTTPS - it guarantees the security of personal data. Such a website instills more trust among users. Additionally, the security of a web resource can affect its position in search results.Generally, a single certificate is sufficient to encrypt the information transmitted between the visitor's browser and the server.
However, some resources require greater reliability and multi-level protection. For example, a bank resource involves large financial transactions. In this case, an SSL certificate is required, which contains not only the domain certificate but the certificate chain (CA Bundle).The SSL certificate chain includes guarantor certificates confirming the validity of the Cyprus Mobile Number List document as a whole. The structure of CA Bundle is as follows: 1Root certificate.2Intermediary Certificates (Intermediate).Each certificate in the chain has an electronic digital signature, linking it to the certificate one step below. The root CA is the top link in the certificate hierarchy. Clarification of CA (Certificate Authority) means that certificates are issued by a certificate authority that confirms the authenticity of encryption keys with this document.SSL certificate chain scheme.
How to configure an SSL certificate chainThe structure of the links in the chain depends on the type of certificate. Typically, this sequence can be obtained with a domain certificate via email or uploaded to the website of the SSL provider that issued the certificate. In this case, the guarantor is a certification authority. The next step is to configure the SSL chain. There are two ways to do this.Create a text documentTo do this, place the certificate chain as a list in a text document. What the CA Bundle looks like can be seen in the example below — certificates with the .crt extension are placed in the order specified: CARoot.crtIntermediate1.crtIntermediate2.crtIntermediate3.crtdomain.crtThe CARoot.crt file here is the root certificate; the intermediate files bundle acts as intermediates, domain.crt is a domain certificate. There may be several guarantors in the chain. The main task is to ensure that all links in the chain are digitally connected to each other.